Thousand Cankers Disease (TCD) is a pest complex that has caused mortality in walnut in many western states. It is now present in the eastern native range of black walnut, but has not been detected in Missouri. TCD is caused by the walnut twig beetle (Pityophthorus juglandis) and an associated fungus (Geosmithia morbida) and black walnut (Juglans nigra) is highly susceptible to this disease..

If you suspect you have seen TCD in Missouri, please contact the Missouri Department of Agriculture, Office of the State Entomologist at (573) 751-5505. For those outside of Missouri, the contact information for your state plant regulatory official can be found at the National Plant Board website at www.nationalplantboard.org under “membership”.

These states are included in the Missouri thousand cankers disease exterior quarantine 2 CSR 70-11.060 which was updated on June 23, 2014.

These states have enacted exterior quarantines (preventing import or transit of regulated walnut articles) or interior quarantines (preventing the intrastate movement of regulated walnut articles).